No sound with Foobar but sound OK with other apps

Hi,
I have been using Foobar for years without problem, but since a few days, I get no sound at all when I try to play an audio file through Foobar.

I used the USB output of my PC that feeds a Balconto Reflink reclocker.

If I play the same file (let say a .WAV file) with another application such as VLC for example, without changin anything to the configuration and still through the Balcanto Reflink, the sound is OK: so this seems to prove that the Belcanto Reflink nor its driver can be the cause of the problem.